Pulverizer



May 21, 1929. J. MoLz 1,714,132

PULVERIZER Filed June zo, 1923 lNvENToR ATTORNEYS Patented May 21, 1929.

UNITED STATES y 1,714,132 PATENT OFFICE.

JOSEPH MOLZ, OF OBERHAUSEN, GERMANY, ASSIGNOR TO THE BABCOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

IPULVERIZER.

Application led June 30, 1923, Serial No.

The present invention relates to improve-- views, and in which Figure 1 is a vertical cross-section, Fig. 2 is a side view, and Fig. 3 is a detail on a larger scale.

As shown, a casing 1 whose lateral wall is completely closed has an opening at the righthand end removably closed by means of a cover 2, which is provided with openings 3 for thesupply of supplementary air, and an opening 4 through which the shaft 7 of the pulverlzing system is introduced. In the left-hand end of the casing are provided air openings 5. Coal, suitably crushed, is fed from hoppers 51 through opening' 52 to the pulverizers. Shaft 7 of the pulverizing system projects through an opening 6. In the contracted part of the casing four angle-rings 8 are arranged between which are adapted to move pulverizing blades 9, which are secured by means of bolts inserted in the bored passages 10 in hubs 1 1 on the shaft 7. The lateral ange of the `left angle-ring is constructed as a complete disc and has an opening 12, which is arranged opposite the opening 52 for the supply of coal, and, in addition, a hole 13 through which the shaft 7 passes.

Against the right-hand angle-rlng vbears a larger angle-rin 14 boundin an annular chamber in one enwall of whic is the opening 15. Within the chamber formed by this angle-ring, two discs 17 and 17 are fastened in a double hubj-16, 16 fixed on the shaft 7. The discs 17, 17 are provided with openings 18 (Fig. 3) with recesses 19 situated opposite one another.' In these recesses areinserted bolts 20," `which are, therefore, held firmly in position, the two discs being joined by means of screws 21. These bolts are' arranged in concentric rings in the discs. Into the ga s between the annular rows lof-.bolts 20 pro]e'ct bolts 22, which are cast'on the lateral flange of the angle-ring 14 and .on `a disc 23 lying against the open side of the angle- V ring 1 4. The anglerings mentioned, together with the dis'c23, 'are united together as a unit, e. g., by meansof tightening screws (not shown .in the drawings),so that they can be removed from the casing 1i with thek shaft 7.l l l5 In an opening 24 inthe disc 23 fits thesuc- 648,679, and in Germany August 1 4, 1922.

,tion inlet of a fan, the runner 25 of which is mounted on the shaft 7; a second fan runner 26 adjacent the fan runner 25, draws auxiliary air through the openings 3 in the cover 2.

By means of the arrangement described, air is drawn through the openings 5 by the fan 25 and through the openings 3 by the fan 26, s0 that the two ends connected with the atmosphere are exposed to a partial vacuum and dust cannot escape therethrough. The two fans discharge through a common outlet 27.

The whole pulverizer system can be drawn out of the shell b withdrawing the shaft, and can be replace by a suitable pulverizing system held in reserve, so that when any disturbance in the pulverizer system takes place, l long interruptions in working are avoided, as the change' of the pulverizer systems, vwhich are complete in themselves, can be effected in a ver short time. The pulverizer system remove can be examined and repaired at leisure.

The whole casing 1 can be rolled and welded from sheet steel, so that any danger due to parts being thrown off by centrifugal force is avoided.

I claim: y

1. A pulverizing mill comprising a casing including a pulverizing chamber having pulverizin units therein, said chamber having inlets or air and material to be pulverized, a fan chamber communicating with said pulverizing chamber, a fan therein arranged to draw a mixture of air and finely divided material through said pulverizin chamber and discharge same through a suitable openin and means for subjecting theportion of said fan chamber remote from said pulverizing chamber to sub-atmospheric pressure.

2. A pulverizing mill comprisinga casing including a pulverizing chamber having pulverizinfr units therein, 'said chamber having inlets fcdr air and material to be ulverized, a fan chamber communicating wit said pulverizing chamber, a fan therein arranged to draw a mixture of air and finely divided ma terial through.. said pulverizing chamber, an exit Aduct communicating with said fan chamber at the peripherythereof and a second fanV insaid fan chamber arranged to draw air through holes in the end of said casing remote lfrom said ulverizing'chamber.

air through the pulverizer, a second fan arranged to draw air in a direction opposite to that ofthe air of said fan first mentioned through the end. of the casing adjacent thereto, and a common outlet for said fans.

4. A pulverizing mill comprising a casing, a shaft located therein, a plurality of pulverizing units operated thereby, a fan mounted on said shaft for drawing air through said units, a second fan on 'said shaft having blades of opposite pitch, a partition between the fans, air inlets at each end of the casing, and a common outlet for said fans.

5. A pulverizing mill comprising a casing having a removable end closure and containing a plurality of revoluble blades therein, chambers for said blades composed of individual angle-rings, said rings being united to one another and removable longitudinally of l tary members and having portions lying.

parallellto the plane of movement of said terial to be pulverized, a fan at the other end of ythe casing for drawing the material through the pulverizing units, and a common drive shaft for the rotary members and the fan, the stationary members being connected together and these members, the rotary members, and the fan being removable through the open end of the casing.

7. A pulverizing mill comprising a casing of cup shape, a removable end closure, a drive shaft extending through the end of the casing and through the endclosure, pulverizer units placed side by side lengthwise of the therethrough through,

casing, each unit comprising 'a stationary member of cup shape and a rotary member driven by the shaft and lying Within its associated stationary member, anda fan Within the casing near the end closure and communieating with the pulverizer units, the stationary members, the rotary members, and the fan being removable bodily through the open end of the casing upon removal of the end closure. .V

JOSEPH MOLZ.. 

